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TPS56121: Capacitor voltage rating for compensation network

Ella KIM
Expert 3862 points
Part Number: TPS56121

Hi Team,

TPS56121 is voltage mode controlled IC and I need to design external loop compensation network.

I wonder if there's any expected side-effect when 25V rating ceremic capacitors are used for the compensation network. Is it okay to use 25V rating capacitors?

EVM designs with 50V rating MLCC for those compensation capacitors as below.

https://www.ti.com/tool/TPS56121EVM-601?keyMatch=&tisearch=search-everything&usecase=partmatches

Thanks,

  • +1
    TI__Genius 16760 points

    You can use 25V or 16V rated capacitors.        The capacitor that connects from the FB pin to the vout  will have largest voltage across it (vout-Vref). 

    General info for ceramic capacitors is that the effective capacitance will be lower from the dc voltage bias.   

    For example, 22uF 6.3V ceramic used on an output of a 5V power supply will have an effective capacitance between 6 to 10uF depending on physical size.

    When using 16V caps or greater on the compensation  network derating the capacitors should not be a concern.